Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
Rialma observes a minor difference in average high-temperatures between November's 27.7°C (81.9°F) and December's 27.2°C (81°F). In December, Rialma records an average nighttime temperature of 19.3°C (66.7°F).Heat index
For most parts of December, the heat index is evaluated at a tropical 31°C (87.8°F). If one endures exposure and continues to be active, it might result in tiredness and heat cramps.Be aware that heat index ratings are designed for shaded locations and minor breezes. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', reflects the blend of air temperature and relative humidity to give a temperature impression. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
Humidity
In December, the average relative humidity is 85%.Rainfall
In Rialma, during December, the rain falls for 29.3 days and regularly aggregates up to 242mm (9.53") of precipitation. In Rialma, during the entire year, the rain falls for 219.6 days and collects up to 1537mm (60.51") of precipitation.Daylight
The month with the longest days is December, with an average of 13h and 0min of daylight.On the first day of the month, sunrise is at 05:38 and sunset at 18:36. On the last day of December, in Rialma, sunrise is at 05:50 and sunset at 18:52 -03.
Sunshine
With an average of 6.9h of sunshine, December has the least sunshine of the year in Rialma.UV index
The months with the lowest UV index are February and December, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The daily maximum UV index of 5 in December interprets into the following advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average December temperature in Rialma?
What is the average humidity in December in Rialma?
How much does it rain in Rialma in December?
When are the longest days in Rialma?
What is the average length of the day in December in Rialma?
When are sunrise and sunset in December in Rialma?
What is the month with the least sunshine in Rialma?
How many hours of sunshine does Rialma have in December?
What are the months with the lowest UV index in Rialma?
How high is the UV index in December in Rialma?
Average temperature in December
Rialma, Brazil
- Average high temperature in December: 27.2°C
The warmest month (with the highest average high temperature) is September (33.5°C).
The month with the lowest average high temperature is January (27°C).
- Average low temperature in December: 19.3°C
The month with the highest average low temperature is October (21°C).
The coldest month (with the lowest average low temperature) is July (16.1°C).
Average pressure in December
Rialma, Brazil
- Average pressure in December: 1011.4mbar
The month with the highest atmospheric pressure is July (1017mbar).
The month with the lowest atmospheric pressure is November (1011mbar).
Average wind speed in December
Rialma, Brazil
- Average wind speed in December: 5.9km/h
The windiest month (with the highest average wind speed) is August (8.3km/h).
The calmest month (with the lowest average wind speed) is March (5.2km/h).
Average humidity in December
Rialma, Brazil
- Average humidity in December: 85%
The month with the highest relative humidity is March (88%).
The month with the lowest relative humidity is September (40%).
Average rainfall in December
Rialma, Brazil
- Average rainfall in December: 242mm
The wettest month (with the highest rainfall) is November (266mm).
The driest month (with the least rainfall) is July (1mm).
Average rainfall days in December
Rialma, Brazil
- Average rainfall days in December: 29.3 days
The months with the highest number of rainy days are January and December (29.3 days).
The month with the least rainy days is August (1.3 days).
Average daylight in December /
Average sunshine in December
Rialma, Brazil
- Average daylight in December: 13h and 0min
The month with the longest days is December (Average daylight: 13h and 0min).
The month with the shortest days is June (Average daylight: 11h and 12min).
- Average sunshine in December: 6h and 5min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in December
Rialma, Brazil
- Average sunshine days in December: 1.5 days
The month with the most sunshine days is August (29 days).
The months with the least sunshine days are February and November (0.7 days).
Average UV index in December
Rialma, Brazil
- Average UV index in December: 5
The months with the highest UV index are August and September (UV index 7).
The months with the lowest UV index are February and December (UV index 5).
Average cloud cover in December
Rialma, Brazil
- Average cloud cover in December: 56
The month with the most cloud cover is December (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in December
Rialma, Brazil
- Average visibility in December: 8km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, February and March (7km).
